Sash lock



FIG. 1 is a perspective view of a sash lock showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side view thereof; and,

FIG. 5 is a left side view thereof.

The ornamental design for a sash lock, as shown and described.